package net.sf.colorer.impl;

import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Reader;
import java.util.Vector;

import net.sf.colorer.LineSource;

/**
 * Implements LineSource interface, reading data from passed Reader stream.
 */
public class ReaderLineSource implements LineSource {

    LineNumberReader reader;

    Vector lines = new Vector();

    int lineCount = 1;

    public ReaderLineSource(Reader reader) {
        this.reader = new LineNumberReader(reader);
    }

    /**
     * Returns total line count in passed reader
     */
    public int getLineCount() {
        while (getLine(lineCount) != null)
            ;
        return lineCount;
    }

    public String getLine(int lno) {
        while (lines.size() <= lno) {
            String line = null;
            try {
                line = reader.readLine();
            } catch (IOException e) {
                return null;
            }
            if (line == null)
                break;
            lines.addElement(line);
            lineCount = lines.size();
        }
        if (lines.size() <= lno)
            return null;
        return (String) lines.elementAt(lno);
    }

}
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Colorer Library.
 *
 * The Initial Developer of the Original Code is
 * Cail Lomecb <cail@nm.ru>.
 * Portions created by the Initial Developer are Copyright (C) 1999-2003
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */